the softwares like mindsoft utilities and system mechanic hav that option, find duplicate files, i guess.. u cud giv a try on it.
but, i hav a large DVD collection of my own, not songs thou. what i do is, write the contents on the DVD on a word file and number them and the DVD as well. so that i jus search for the required string(partial strings also) and get the DVD number... i was abt to create a program which does the same but ran out of time thinking on "how to" !!!!
/legolas